Polygons
Name a polygon with 5 sides
Pentagon
What do we call a four sided polygon?
Quadrilateral
What type of angle measures less than 90 degrees?
Acute angle
What word describes 2 lines that never meet and are always the same distance apart?
Parallel
Is a circle open or closed?
What do you call a polygon with 8 sides?
Octogon
Which quadrilateral has exactly 1 pair of parallel lines?
Trapezoid
Which angle measures exactly 90 degrees?
Right angle
What does it means for a shape to be congruent to another shape?
Congruent: They are the same shape and size
What does perpendicular mean? Give 1 example of something perpendicular.
Perpendicular: lines, segments, or rays that cross to form a 90 degree angle.
Example: street signs, a plus sign, streets that cross, edge of paper or square.
How many sides does a hexagon have?
6 sides
Name the quadrilateral that has four equal sides but does not need right angles
Rhombus
What do you call an angle that measures between 90 and 180 degrees?
Obtuse
What is an adjacent side or adjacent angle?
Adjacent: Next to each other; adjacent sides also share vertex, adjacent angles share a common side and vertex
Define ”Isosceles“ and give a quick sketch description. (describe which sides are equal)
Isosceles have 2 congruent sides. (2 equal sides)
Is a shape with all sides equal and all angles equal called regular or irregular?
Regular
Which quadrilateral always has four right angles and opposite sides parallel?
Rectangle
If a triangle has no equal sides, what is it called?
Scalene triangle
Explain What makes a shape concave versus convex in one clear sentence
A convex shape has all its angles pointing outward (none bigger than 180°), while a concave shape has at least one angle that goes inward, creating a “dent” (an angle greater than 180°).
Parallel: Lines that do not meet
Example: railroad tracks, opposite sides of a rectangle, lanes on a road
Describe how a square fits the definition of both a rectangle and a rhombus
A rectangle has 4 equal sides (rhombus) and 4 right angles opposite sides parallel (Rectangle).
A triangle has angles 30, 60, and 90 degrees. What type of triangle is this by angles?
Right triangle (Also called a 30-60-90 triangle)
A regular pentagon is placed so one side is horizontal. How many lines of symmetry does a regular pentagon have?
5 lines of symmetry
Define ”Symmetry“ and explain how you would test if whether a shape has reflective symmetry
Symmetry: A shape has symmetry if it can be folded or reflected so the two halves match exactly. (A line that cuts a shape exactly in half).
Test: fold along the line (or draw a mirror line) and see if both sides coincide